高寒草甸不同海拔梯度下多年生黄帚橐吾的克隆生长特征

Characteristics of clonal growth of Ligularia virgaurea to different elevation gradient on alpine meadow

通过对多年生植物黄帚橐吾(Ligulariavirgaurea)在四个不同海拔梯度下的克隆生长行为进行研究,结果表明:(1)资源水平(土壤养分)、干扰和群落性质影响间隔物(spacer)长度的变化。在第一和第四海拔梯度中(土壤养分较丰富)间隔物长度较短,而在第二和第三海拔梯度中(土壤养分较贫乏)间隔物长度较长,说明其能对资源水平和生境优劣作出反应。(2)分枝强度(branchingintensity)随资源水平的增加而上升。(3)在高海拔、寒冷和资源较丰富的生境中,其生物量的投资偏向于地下部分生物量,说明黄帚橐吾的资源分配方式受到环境资源条件和群落性质的影响。

The characteristics of clonal growth of perennial plant Ligularia virgaurea was studied in respect to four different elevation gradients. The results showed: (1) Spacer length was affects by resource levels(soil nutrition), disturbance and community characteristics. Spacer length was shorter in the first and fourth elevation gradient, but that was longer in the second and third elevation gradient, This showed that spacer length of Ligularia virgaurea was affected by resource levels and environmental condition. (2) Branching intensity increased with environmental resource levels. (3) Greater biomass allocation of Ligularia virgaurea to below-ground biomass in the condition where was colder, highly altitude and abundantly resource. This indicated that patterns of resource allocation of Ligularia virgaurea were also influenced by both environmental resource condition and community characteristics.